The Twitter account belonging to Newsweek was hacked by ISIS supporters on Tuesday morning, the news organization told BuzzFeed.
At around 10:45 a.m. ET, the Newsweek's Twitter account began posting messages with the hashtag Cyber Caliphate. The profile picture and banner image were changed to reflect a masked person with the words "Je SuIS IS", a clear reference to the expression, “Je suis Charlie,” that came out of the terrorist attacks on French newspaper Charlie Hebdo in Paris last month.
The hackers warned of continuing their campaign of CyberJihad against the United States.
“While the US and its satellites are killing our brothers in Syria, Iraq and Afghanistan we are destroying your national cybersecurity system from inside,” the hackers posted.
The FBI is investigating the hack as some messages posted threatened the Obama family.
The hackers also leaked documents purportedly from the Defense Cyber Investigations Training Academy that appear to describe intelligence gathering programs for social media.
Newsweek has since regained control of the account.
"We can confirm that Newsweek's Twitter account was hacked this morning, and have since regained control of the account," Newsweek managing editor Kira Bindrim said in a statement. "We apologize to our readers for anything offensive that might have been sent from our account during that period, and are working to strengthen our newsroom security measures going forward."
The ISIS supporters vowed to threaten cybersecurity for the U.S., but their efforts could be halted by the infamous hacking group Anonymous who has launched a cyberwar against ISIS and its supporters.
Newsweek reported that the International Business Times website, the Twitter account of the Latin Times, and the Newsweek affiliate Tumblr account, the Newsweek Archivist, were all also hacked by the same group on Tuesday.